J. Chem. InJ Comput. Sci. 1995, 35, 786
786
ERRATA The Walk ID Number Revisited [J. Chem. Znf. Comput. Sci. 33,23 1-233 (1993)J By Wolfgang R. Muller, Klaus Szymanski, Jan V. b o p , Zlatko MihaliC, and Nenad TrinajstiC*. The Computer Centre, The Heinrich Heine University, D-40225 Dusseldorf, The Federal Republic of Germany, Faculty of Science and Mathematics, The University of Zagreb, HR-41001 Zagreb, The Republic of Croatia, and The Rugjer BolkoviE Institute, HR-41001 Zagreb, The Republic of Croatia Pages 231 and 233. In his recent letter Professor Lu Xu from the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China, informed us that he could not repeat our results reported as Figures 1 and 2 in our paper. The consequent analysis performed by us has shown that we did not report the self-retuming walk ID (SID) numbers in these figures. The error was introduced during the preparation of Figures 1 and 2 when we printed by accident the walk ID (WID) numbers instead of the SID numbers undemeath each structure in both figures. Below the corrected Figures 1 and 2 are given that now contain the SID numbers.
SID = 10.04724089
SID = 10 04407334
SID = 10 04183347
SID = 10 05310476
/
A Simplified Algorithm Using Base 5 Numbers To Assign Canonical Names to Cata-Condensed Benzenoid Polybenzenes [ J . Chem. lnf. Comput. Sci. 34, 637-640 (1994)l By Seymour B. Elk. Elk Technical Associates, New Milford, NJ. Pages 637-640: As pointed out by Nenad TrinajstiC in his paper’ in this issue (p 759), my earlier paper,* contains the error he detected. Although the mistake noted is in obvious need of correction, it is easily rectified by rotating the molecule (if necessary) so that the incoming vector is progressing horizontally from left to right thus “anchoring” the molecule. We now include in the coding algorithm the proviso that whenever encountering the first polyfilar hexagon in a chosen path one follows the “upper” path before following the “lower”. In other words, this is the same scenario that I noted in an article3 that appeared in 1980 in MATCH. In that article, I described the “more than semantical” difference between what I termed a “synthetic” (locally generated and moving) vs an “analytic” (fixed initially and remaining invariant) nomenclature algorithm and noted how a synthetic code would eventually always lead to inconsistency in a large and sufficiently complex system. Using my code with this correction, the upper half of their Figure 7 would be named 114302 and the lower one 114203-which is precisely compatible with the results obtained by their DAST code. REFERENCES AND NOTES
SID=1004363456
SID=1005990529
SID=1005356871
SID =lo04935166
Muller, W. R.; Szymanski, K.; h o p , J. V.; TrinajstiC, N. A Remark on the Naming of Cata-Condensed Benzenoids with Base 5 Numbers. J . Chem. In5 Comput. Sci. 1995, 35, 759-760. Elk, S. B. A Simplified Algorithm Using Base 5 Numbers To Assign Canonical Names to Cata-Condensed Benzenoid Polybenzenes. J . Chem. In$ Comput. Sci. 1994. 34, 637-640. Elk, S. B. A Nomenclature for Regular Tesselations and its Applications to Polycyclic Aromatic Hydrocarbons. MATCH 1980, 8, 121-158. (39503851
SID = 10 04186151
SID = 10 03924949
Slb = 10 03739247
SID = 10 03364436
Figure 1. SID numbers for a class of cyclic graphs with 10 vertices and 10 edges.
SID i10.13655460
SI0 = 10.13655460
SID = 10.13655460
Figure 2. Three representations of the Petersen graph and the corresponding SID numbers. CI9500360
0095-2338/95/1635-0786$09.00/0
0 1995 American Chemical Society
